[GHC] #8990: Performance tests behave differently depending on presence of .hi file (even with -fforce-recomp)

[GHC]

#8990: Performance tests behave differently depending on presence of .hi file
(even with -fforce-recomp)
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Test Suite        |              Version:  7.9
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by ezyang):

 * owner:  przembot =>
 * status:  patch => new
 * differential:  Phab:D1267 =>


Comment:

 On the Phabricator CR, Simon Marlow pointed out that pretending the
 interface file doesn't exist when forcing recompilation can result in
 gratuitous changes to the timestamp on the interface file. So we can't
 take this approach; let's just remove hi files before perf tests.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8990#comment:6>
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